<ion-header>
  <ion-toolbar>
    <ion-buttons slot="start">
      <ion-back-button defaultHref="/packet-set-pay"  text="" ></ion-back-button>
    </ion-buttons>
    <ion-title>选择盒子</ion-title>
  </ion-toolbar>
</ion-header>
<ion-content>
  <p (click)="takePicture()">
    index works!
  </p>
</ion-content>
